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[Gearbox inquiry form](https://www.airtools.com.tw/gearbox-inquiry-form/)-- [ ** Menu ](#)-[Home](https://www.airtools.com.tw) - [Products](https://www.airtools.com.tw/products/) - FRL Units and Auto Drain[** **Filter**](#)(Also known as Air Preparation Units / Filter–Regulator–Lubricator Assemblies with Automatic Drain)FRL Units and Auto Drain are essential air preparation components designed to improve the performance, reliability, and lifespan of pneumatic systems in industrial manufacturing, automotive service, construction, and general maintenance environments. FRL stands for Filter Regulator Lubricator, which works together to clean, regulate, and condition compressed air before it reaches downstream tools and equipment. The filter removes dust, moisture, and contaminants; the regulator ensures a stable outlet pressure; and the lubricator provides a controlled oil mist to reduce internal wear and extend tool life.An auto drain automatically removes accumulated water and impurities from the air filter bowl, preventing corrosion, blocked passages, and performance loss without requiring manual draining. Built with durable housings, precision valves, and long-life seals, these components deliver consistent airflow, improved efficiency, and dependable operation in continuous-duty applications. Their compact modular design allows easy installation, adjustment, and maintenance while supporting a wide range of pneumatic tools and machinery.FRL Units and Auto Drain are ideal for factories, workshops, automotive garages, assembly lines, and industrial facilities that require clean, regulated, and properly lubricated compressed air to protect equipment, reduce downtime, enhance safety, and achieve reliable, high-performance pneumatic operation.[*FRL Units and Auto Drain [ZC-130-3A 3/8 inch F.R.L. Unit](https://www.airtools.com.tw/zc-130-3a-38-inch-f-r-l-unit/) [ ](https://www.airtools.com.tw/zc-130-4a-12-inch-f-r-l-unit/) FRL Units and Auto Drain [ZC-130-4A 1/2 inch F.R.L. Unit](https://www.airtools.com.tw/zc-130-4a-12-inch-f-r-l-unit/) [ ](https://www.airtools.com.tw/zd-130-auto-drain/) FRL Units and Auto Drain [ZD-130 Auto Drain](https://www.airtools.com.tw/zd-130-auto-drain/) Product search Product categories- [Wireless Rotary Torque Transducer](https://www.airtools.com.tw/wireless-rotary-torque-transducer/) [TTEB Series Wireless Rotary Torque Transducer (Screw Bits Holder)](https://www.airtools.com.tw/tteb-series-wireless-rotary-torque-transducer-screw-bits-holder/) - [TTEH / TTAH Series Wireless Rotary Torque Transducer (Impact Socket Output)](https://www.airtools.com.tw/tteh-ttah-series-wireless-rotary-torque-transducer-impact-socket-output/) - [TTES / TTAS Series Wireless Rotary Torque Transducer (Square Drive)](https://www.airtools.com.tw/ttes-ttas-series-wireless-rotary-torque-transducer-square-drive/)[Cordless Power Tools](https://www.airtools.com.tw/cordless-power-tools/)- [Cordless Angle Grinder](https://www.airtools.com.tw/cordless-angle-grinder/) - 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[FRL Units and Auto Drain](https://www.airtools.com.tw/frl-units-and-auto-drain/) - [Blind Rivet and Rivet Nut Adapter](https://www.airtools.com.tw/blind-rivet-and-rivet-nut-adapter/) - [Spring Balancer](https://www.airtools.com.tw/spring-balancer/) - [Industrial Anti-Vibration Sander Pad](https://www.airtools.com.tw/industrial-anti-vibration-sander-pad/) - [Display Stand](https://www.airtools.com.tw/display-stand/)[Precision Gear Reducer](https://www.airtools.com.tw/precision-gear-reducer/)- [Standard Precision Gear Reducer](https://www.airtools.com.tw/standard-precision-gear-reducer/) - [Ultra Precision Gear Reducer](https://www.airtools.com.tw/ultra-precision-gear-reducer/) - [Economy Gear Reducer](https://www.airtools.com.tw/economy-gear-reducer/) - [Right Angle Gear Reducer](https://www.airtools.com.tw/right-angle-gear-reducer/) Latest News- [How Shock Reduced Air Hammers Changed the Industry](https://www.airtools.com.tw/how-shock-reduced-air-hammers-changed-the-industry/) - [From Assembly Line to Quality Record: A Practical Guide to Torque Measurement](https://www.airtools.com.tw/from-assembly-line-to-quality-record-a-practical-guide-to-torque-measurement/) - [New tutorial video available for Torque Monitoring System](https://www.airtools.com.tw/new-tutorial-video-available-for-torque-monitoring-system/) - [Professional Fastening Solutions with New Dual-Flex Angle Air Impact Wrenches: ZIW340FA and ZIW410FA](https://www.airtools.com.tw/professional-fastening-solutions-with-new-dual-flex-angle-air-impact-wrenches-ziw340fa-and-ziw410fa/) - [Next-Generation Composite Air Impact Wrenches: ZIW1020C and ZIW1010C MINI](https://www.airtools.com.tw/next-generation-composite-air-impact-wrenches-ziw1020c-and-ziw1010c-mini/) ISO 9001:2015 certified professional OEM/ODM air pneumatic tool, gear reducer, wireless transducer, torque controller, torque monitoring system, torque measuring & torque calibration equipment and precision machining parts manufacturer from Taiwan (R.O.C) with over 40 years of experiences in the industry.Passion For Innovation- [Home](https://www.airtools.com.tw/) - [News](https://www.airtools.com.tw/news/) - [About us](https://www.airtools.com.tw/about-china-pneumatic-corporation/) - 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